Re: Memory speed question

Amir,

I'd recommend pushing hard for concrete information: a KB or support documentation from Cisco. Lacking substantiation, it's just an opinion.

Don't allow hearsay, opinions, and myths to propagate without challenge. Be respectful, be polite, but be firm.

Hope this helps...

-Tim

On 3/31/17 13:08, Hameed, Amir wrote:
>
> For that we will need to buy memory and then add it to the host which
> is what we are trying to avoid. We have also asked our data center to
> check with Cisco and the response we got was that “mileage will vary”.
>
> *From:* Dimensional DBA [mailto:dimensional.dba_at_comcast.net]
> *Sent:* Friday, March 31, 2017 3:01 PM
> *To:* Hameed, Amir <Amir.Hameed_at_xerox.com>; 'ORACLE-L'
> <oracle-l_at_freelists.org>
> *Subject:* RE: Memory speed question
>
> It is simplest to run a benchmark and you will see that your app will
> notice a difference if you have a low latency app.
>
> It also limits the overall amount of work that can be accomplished on
> that blade.
>
> *Matthew Parker*
>
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>
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> *From:*oracle-l-bounce_at_freelists.org
> <mailto:oracle-l-bounce_at_freelists.org>
> [mailto:oracle-l-bounce_at_freelists.org] *On Behalf Of *Hameed, Amir
> *Sent:* Friday, March 31, 2017 11:55 AM
> *To:* 'ORACLE-L'
> *Subject:* Memory speed question
>
> We have a four-node ESX farm/cluster where each node is loaded with
> 512G of physical memory. These ESX nodes are Cisco UCS blades. We are
> looking into adding more memory to each of these ESX hosts to increase
> the footprint to 750G/node. One of the data center architects had
> informed us last year that per Cisco, the sweet-spot of memory
> footprint on these blades is 512GB, after that the memory access speed
> would drop from 1600MHZ to 1066MHZ (a drop of ~ 30%). Because all of
> our VMs host application tiers and they run a lot of JVM processes, we
> are concerned that a drop of 30% will negatively impact our
> applications’ performance. However, our data center has been telling
> us that the drop will not be noticed by the application which I find
> hard to believe. We also do not want to add another ESX host because
> of licensing cost.
>
> I was wondering if anyone is running their ESX hosts with memory over
> 512G/host and if they observed any issue with memory speed.
>
> Thank you,
>
> Amir
>

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